feat: multiple native assets (WIP) #134

Job	Run time
check no-default-features	33s
check serde	34s
check std	26s
clippy	2m 3s
docs	2m 12s
fmt	4s
test stable --no-default-features	1m 27s
test stable	1m 30s
test stable --all-features	2m 20s
test beta --no-default-features	3m 55s
test beta	3m 45s
test beta --all-features	4m 19s
test nightly --no-default-features	1m 44s
test nightly	1m 56s
test nightly --all-features	2m 13s
	29m 1s

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